feat: support hidden source maps to map error stack traces from crash reports

Author: DimitarTachev

Diff for: templates/webpack.angular.js

@@ -47,6 +47,7 @@ module.exports = env => {
         uglify, // --env.uglify
         report, // --env.report
         sourceMap, // --env.sourceMap
+        hiddenSourceMap, // --env.hiddenSourceMap
         hmr, // --env.hmr,
         unitTesting, // --env.unitTesting
     } = env;
@@ -96,6 +97,13 @@ module.exports = env => {
         additionalLazyModuleResources: additionalLazyModuleResources
     });
 
+    let sourceMapFilename = "[file].map";
+    if (typeof hiddenSourceMap === "string") {
+        sourceMapFilename = join(relative(dist, __dirname), hiddenSourceMap, "[file].map");
+    } else if (typeof hiddenSourceMap === "boolean" && !!hiddenSourceMap) {
+        sourceMapFilename = join(relative(dist, __dirname), "sourceMap", "[file].map");
+    }
+
     const config = {
         mode: uglify ? "production" : "development",
         context: appFullPath,
@@ -112,6 +120,7 @@ module.exports = env => {
         output: {
             pathinfo: false,
             path: dist,
+            sourceMapFilename,
             libraryTarget: "commonjs2",
             filename: "[name].js",
             globalObject: "global",
@@ -142,7 +151,7 @@ module.exports = env => {
             "fs": "empty",
             "__dirname": false,
         },
-        devtool: sourceMap ? "inline-source-map" : "none",
+        devtool: hiddenSourceMap ? "hidden-source-map" : (sourceMap ? "inline-source-map" : "none"),
         optimization: {
             runtimeChunk: "single",
             splitChunks: {
@@ -164,7 +173,7 @@ module.exports = env => {
                 new UglifyJsPlugin({
                     parallel: true,
                     cache: true,
-                    sourceMap: !!sourceMap,
+                    sourceMap: !!sourceMap || !!hiddenSourceMap,
                     uglifyOptions: {
                         output: {
                             comments: false,